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Dissertations / Theses on the topic 'Amphibians'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Rothermel, Betsie. "Movement behavior, migratory success, and demography of juvenile amphibians in a fragmented landscape /." free to MU campus, to others for purchase, 2003. http://wwwlib.umi.com/cr/mo/fullcit?p3099626.

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2

Patrick, David A. "The Effects of Forest Practices on a Maine Amphibian Community." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/PatrickDA2007.pdf.

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3

Crockett, Marquette Elaine. "Survey and Comparison of Amphibian Assemblages in Two Physiographic Regions of Northeast Tennessee." [Johnson City, Tenn. : East Tennessee State University], 2001. http://etd-submit.etsu.edu/etd/theses/available/etd-0605101-155522/unrestricted/crockett0611.pdf.

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4

Regula, Meyer Lisa. "Invasive plants and native amphibians| The implications for amphibian conservation in eastern North America." Thesis, Kent State University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3618851.

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<p> Humans introduce non-native plants to new areas at an increasing rate with the increased movement across the globe. These invasive species can become mono-cultures and extremely different from the native floral community. Amphibians, at the same time, are facing global declines with approximately one-third of all amphibians threatened or endangered. Due to the importance of amphibians as prey items for many vertebrates including small birds, mammals, and reptiles, and also predator controls over many invertebrates, including some pest species, the decline of amphibians has large implicat

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5

Regula, Meyer Lisa K. "INVASIVE PLANTS AND NATIVE AMPHIBIANS: THE IMPLICATIONS FOR AMPHIBIAN CONSERVATION IN EASTERN NORTH AMERICA." Kent State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=kent1384952870.

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6

Schneider, Amy Elizabeth. "Continued study of the use of created ponds for amphibian breeding in fragmented forested areas." [Huntington, WV : Marshall University Libraries], 2008. http://www.marshall.edu/etd/descript.asp?ref=876.

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7

Regosin, Jonathan V. "Terrestrial habitat use by pool-breeding amphibians in a suburban landscape /." Thesis, Connect to Dissertations & Theses @ Tufts University, 2003.

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Thesis (Ph.D.)--Tufts University, 2003.<br>Adviser: J. Michael Reed. Submitted to the Dept. of Biology. Includes bibliographical references (leaves 124-134). Access restricted to members of the Tufts University community. Also available via the World Wide Web;

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8

Penner, Johannes. "Macroecology of West African amphibians." Doctoral thesis, Humboldt-Universität zu Berlin, Lebenswissenschaftliche Fakultät, 2014. http://dx.doi.org/10.18452/17035.

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Amphibienpopulationen sind weltweit bedroht. Für fundierte Entscheidungen im Naturschutz ist ein wissenschaftliches Hintergrundwissen notwendig. Eine wichtige Komponente ist die Verbreitung der Arten und die Gründe hierfür. Dies setzt auch Klarheit bezüglich des taxonomischen Status voraus. Vernachlässigte Regionen liegen meist in den Tropen. Um diese Lücke zu füllen, untersucht die vorliegende Arbeit die Makroökologie westafrikanischer Amphibien. Eine neue Art der Familie Phrynobatrachidae wird beschrieben. Anschließend werden die taxonomischen Unterschiede zweier Mitglieder der Familien der

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9

Lau, Kwan-wa. "Cloning and characterization of the first amphibian secretins and secretin receptor functional implication of secretin with orexin in amphibians /." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B44143655.

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10

McMaster, Kellie Anne. "Ecophysiology of Australian cocooning and non-cocooning, burrowing, desert frogs /." Connect to this title, 2006. http://theses.library.uwa.edu.au/adt-WU2007.0138.

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11

Lau, Kwan-wa, and 劉君華. "Cloning and characterization of the first amphibian secretins and secretin receptor: functional implication ofsecretin with orexin in amphibians." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B44143655.

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12

Hopkins, Samantha. "Chytridiomycosis in amphibian populations in the Western Cape, South Africa." Thesis, University of the Western Cape, 2002. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_7137_1359702947.

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<p>There have been many cases reported of amphibian populations declining. These are often due to anthropogenic factors such as habitat destruction and pollution. However, some eclines have not had an obvious cause and many of these have been investigated and found to be due to pathogenic disease. Batrachochytrium dendrobatidis is a recently described pathogen of frogs. The population declines that have been associated with chytridiomycosis have occurred in relatively undisturbed areas such as national parks. The declines tend to occur at higher altitudes or in colder climates. This is thought

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13

White, Steve. "Population trends, conservation and the trade in amphibians in Asia." Thesis, View the Table of Contents & Abstract, 2005. http://sunzi.lib.hku.hk/hkuto/record/B34737364.

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14

Ruthsatz, Katharina [Verfasser], and Kathrin H. [Akademischer Betreuer] Dausmann. "Amphibians in a changing world : an ecophysiological perspective on amphibian metamorphosis / Katharina Ruthsatz ; Betreuer: Kathrin H. Dausmann." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2019. http://d-nb.info/1176702076/34.

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15

Mcmahon, Taegan A. "Understanding Amphibian Decline: the Role of Pesticides and the Pathogenic Chytrid Fungus on Amphibians and Aquatic Communities." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4727.

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Amphibians are the most threatened taxon on the planet. Declines have been associated with over-exploitation, habitat loss, pollution, and pathogenic diseases, but of these factors, pollution and disease have been relatively under-studied. Here, I investigated: 1) the impacts of commonly used pesticides on aquatic communities, 2) the effect of these pesticides on amphibian susceptibility to the pathogenic chytrid fungus, Batrachochytrium dendrobatidis (Bd), and 3) whether there are non-amphibian hosts of Bd and 4) how to best quantify the survival of Bd through ontogeny of the host. In my firs

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16

Ruthsatz, Katharina Verfasser], and Kathrin H. [Akademischer Betreuer] [Dausmann. "Amphibians in a changing world : an ecophysiological perspective on amphibian metamorphosis / Katharina Ruthsatz ; Betreuer: Kathrin H. Dausmann." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2019. http://nbn-resolving.de/urn:nbn:de:gbv:18-95339.

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17

Zainab, Tayyaba. "A study of parapinopsin in amphibians." Thesis, King's College London (University of London), 2014. http://kclpure.kcl.ac.uk/portal/en/theses/a-study-of-parapinopsin-in-amphibians(d10ebd14-a9be-4efc-a8b5-ebca004fb11d).html.

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Parapinopsin (PNP) is a novel pigment protein present in pineal gland of the brain. PNP protein is similar in function to the human visual pigment protein rhodopsin, found in the eye. The aim of project is to sequence and characterize PNP in different frogs species to understand more about PNP as little is known about its structure and function. Tadpole cDNA from different frogs species (X.laevis, Rana temporaria and Rana tigrina) were used during the project. PCR primers were designed against Xenopus tropicalis PNP cDNA the only reported sequence at NCBI. PNP PCR products were cloned into pGE

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18

Maddock, S. T. "Systematics and phylogeography of Seychelles amphibians." Thesis, University College London (University of London), 2016. http://discovery.ucl.ac.uk/1476198/.

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This thesis investigates evolutionary patterns of variation in endemic amphibians from the Seychelles archipelago. Focal groups include the treefrog (Tachycnemis seychellensis), and a radiation of caecilians in three genera (Grandisonia, Hypogeophis and Praslinia), and attempts to place these into a phylogenetic context. The introduction (Chapter 1) discusses the importance of islands in the study of evolution and examines patterns of intraspecific variation that have been reported in other Seychelles organisms. Chapter 2 provides the first intraspecific molecular study of the monotypic Seyche

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19

Pulliam, Robert. "Evolutionary history of amphibians in biodiversity hotspots." Connect to resource, 2006. http://hdl.handle.net/1811/6021.

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Thesis (Honors)--Ohio State University, 2006.<br>Title from first page of PDF file. Document formattted into pages: contains 32 p.; also includes graphics. Includes bibliographical references (p. 17-19). Available online via Ohio State University's Knowledge Bank.

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20

Fröbisch, Nadia. "Ontogeny and phylogeny of small dissorophoid amphibians." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22015.

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This study considers the ontogeny and phylogeny of branchiosaurids and amphibamids, small dissorophoid amphibians from the Upper Carboniferous and Lower Permian. Both clades play a central role in the discussion of the controversial relationships and origins of the three modern amphibian groups from among possible Paleozoic antecedents. An extraordinary fossil record comprising hundreds of specimens and many ontogenetic stages distinguishes branchiosaurids. This allowed for a detailed study of the ossification sequence of the limb skeleton in the branchiosaurid Apateon, which revealed that bra

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21

Wood, Laura R. "Diversity and distribution of amphibians in Luxembourg." Thesis, University of Kent, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.544084.

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22

Rollins, Hilary Byrne. "Ecological Effects of Climate Change on Amphibians." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1559915081386624.

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23

Bielby, Jon. "Extinction risk and population declines in amphibians." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/4278.

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This thesis is about understanding the processes that explain the patterns of extinction risk and declines that we see in amphibians, how we can use that understanding to set conservation priorities, and how we can convert those priorities into practical, hands-on research and management. In particular, I focus on the threat posed by the emerging infectious disease, chytridiomycosis, which is caused by the chytrid fungus, Batrachochytrium dendrobatidis (Bd). Amphibians display a non-random pattern of extinction risk, both taxonomically and geographically. In chapter two I investigate the mecha

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24

Carey, Marc Brandon. "Brainstem auditory evoked potentials in anuran amphibians." PDXScholar, 1992. https://pdxscholar.library.pdx.edu/open_access_etds/4267.

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In this study, I looked at the effects of sound level, temperature and dehydration/hypernatremia on the brainstem auditory evoked potential (BAEP) of four species of anuran amphibians (Rana pipiens, Rana catesbeiana, Bufo americanus and Bufo terrestris). The BAEP was used because it allowed me to monitor both the peripheral and central aspects of auditory nervous function simultaneously and over a long period of time.

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25

Enright, Lisa. "Effects of selection logging on amphibian diversity and abundance in shade-tolerant hardwood forests of Algonquin Provincial Park, Ontario." Connect to this title online, 1998. http://www.nlc-bnc.ca/obj/s4/f2/dsk2/ftp03/MQ35886.pdf.

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26

Gahl, Megan K. "Spatial and Temporal Patterns of Amphibian Disease in Acadia National Park Wetlands." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/GahlMK2007.pdf.

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27

Gross, Lee M. "Long-term assessment of predatory fish removal on a pond-breeding amphibian community in central Illinois /." View online, 2009. http://repository.eiu.edu/theses/docs/32211131565136.pdf.

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28

Orton, Frances. "Investigation into the effects of pesticides on amphibians." Thesis, Brunel University, 2008. http://bura.brunel.ac.uk/handle/2438/2456.

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Amphibian population decline is a recognised phenomenon spanning at least the last 40 years, and it is likely that a number of factors have contributed, including environmental contamination. Amphibians are vulnerable to agrochemical uptake as they must breed in water, and often spend the aquatic phase of their lifecycle in agricultural water bodies, which may contain a complex mixture of biologically active chemicals. Endocrine disrupting compounds may cause reproductive effects in humans and wildlife, although the link between pesticides and endocrine disruption is largely unknown. Therefore

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29

Wombwell, Emma Louise. "Emerging infectious disease and the trade in amphibians." Thesis, University of Kent, 2014. https://kar.kent.ac.uk/48014/.

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Amphibians are the most threatened class of vertebrate, and rates of species decline and extinction far exceed those seen historically. Habitat loss, climate change, over-exploitation and emerging infectious disease have all been identified as threatening processes. The trade in amphibians has been implicated in over-exploitation through the harvesting of wild animals, and as an important pathway for the global spread of the fungal pathogen, Batrachochytrium dendrobatidis (Bd). However, there are no analyses of how Bd may spread through the trade chain. This thesis addresses this issue by (1)

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30

Michaels, Christopher. "Evidence based ex situ husbandry for captive amphibians." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/evidence-based-ex-situ-husbandry-for-captive-amphibians(54a41c4e-a6cb-471c-8c16-ef012f61cd35).html.

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Amphibians are declining worldwide in response to pressures that are too numerous, difficult and rapid to ameliorate in the wild before some taxa become extinct. Ex situ conservation, whereby animals are maintained in captivity until threats in the wild have been resolved, is the only means of saving up to five hundred amphibian species. Amongst political, financial and practical hurdles, the most fundamental problem for these programmes is lack of knowledge about how to maintain species successfully in captivity. Captive populations have failed to survive or reproduce and, furthermore, captiv

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31

Ward, Rocky. "Multivariate Analyses of Amphibian and Reptilian Distribution in Texas." Thesis, University of North Texas, 1988. https://digital.library.unt.edu/ark:/67531/metadc331167/.

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Presence-absence data for amphibians, chelonians, saurians, ophidians, and the terrestrial and aquatic ecological guilds of reptilians were analyzed using multivariate analyses. Geographically consistant distributional patterns were found for all faunal groupings. The correspondence between analyses of the different taxa and guilds was not perfect, but similarities were found. All analyses agreed on the presence of a distinctive region in east Texas. Most analyses also agreed on the presence of distinctive regions in south Texas, the Trans-Pecos, the Edwards Plateau, and north-west Texas. Ther

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32

James, Stacy M. "Amphibian metamorphosis and juvenile terrestrial performance following chronic cadmium exposure in the aquatic environment." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/4140-D1763/.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2005.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (May 24, 2006) Vita. Includes bibliographical references.

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33

Cowman, Deborah Fay. "Pesticides and amphibian declines in the Sierra Nevada Mountains, California." Diss., Texas A&M University, 2005. http://hdl.handle.net/1969.1/4770.

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Pacific chorus frog (Pseudacris regilla) hatchlings were translocated and placed in cages in sites (~2,200 m elevation) located in Lassen, Yosemite, and Sequoia National Parks. DDE was found in 97% of Yosemite National Park samples, 84% in Sequoia National Park samples, and 15% of Lassen Volcanic National Park samples in 2001 and 2002. Total endosulfans were detected in 3% of Sequoia samples, 9% of Lassen samples and 24% of Yosemite samples. Both pesticides were detected in tadpoles and metamorphs raised at the three parks regardless of origin. Because the tadpoles were translocated post hatch

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34

Badawy, Gamal Metwally. "Development of the gastro-intestinal regulation in the axolotl (Ambystoma mexicanum)." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273975.

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35

Dinehart, Simon K. "The effects of Disturbance on Aquatic Breeding Amphibians within the Cuyahoga Valley National Park." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1133815626.

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36

Northrop, Robert John. "Development and assessment of a wildlife habitat relationship model for terrestrial vertebrates in the state of Maryland." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 152 p, 2009. http://proquest.umi.com/pqdweb?did=1885544331&sid=2&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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37

Tufts, Bruce Laurie. "Ion exchange mechanisms for the control of volume and pH in fish and amphibian erythrocytes." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/29443.

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The characteristics of the ion exchange mechanisms which regulate volume and pH in fish and amphibian erythrocytes were investigated and compared. Experiments were carried out under steady state conditions and also following adrenergic stimulation both in vivo and in vitro. Under steady state conditions, a decrease in extracellular pH caused an increase in the volume of rainbow trout erythrocytes, and a decrease in the intracellular pH. These pH-induced volume changes were mainly associated with movements of chloride across the chloride/bicarbonate exchange pathway. The sodium/proton exchange

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38

Faruk, Aisyah. "The impact of oil palm conversion on tropical amphibians." Thesis, Queen Mary, University of London, 2013. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8458.

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Agriculturally-altered habitats, especially oil palm plantations, are rapidly dominating the Southeast Asian landscape. Although recent studies have shown reduced species diversity associated with this commodity, data on amphibian diversity are rare. The following thesis explores the impact of oil palm plantations on amphibians in Peninsular Malaysia based on (1) amphibian biodiversity, (2) quality and use of breeding sites, (3) habitat use and (4) parasitism. Contrary to expectation, not all metrics of biodiversity differed between oil palm plantations and secondary forest sites. Amphibian co

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39

McConville, J. R. "Brain Mechanisms Associated with Motivation in Amphibians and Fish." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501325.

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40

Marques, Sérgio Miguel Reis Luís. "Gene expression in understanding mechanisms of toxicity in amphibians." Doctoral thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/8257.

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Doutoramento em Biologia<br>De uma forma geral os anfíbios são conhecidos como organismos que apresentam uma grande sensibilidade a vários tipos de contaminantes. Contudo existem casos, como o de Pelophylax perezi (rã-verde), em que estes organismos habitam áreas extremamente contaminadas. Este facto verifica-se na mina de urânio desactivada, da Cunha Baixa (Viseu, centro de Portugal), em que uma população destas rãs habita na lagoa de efluente ácido mineiro (M). Estudos ecotoxicológicos anteriores com estes organismos revelaram apenas efeitos de toxicidade ténues levantando algumas que

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41

Marques, Mariana Pimentel. "Geographical distribution of the amphibians and reptiles of Angola." Master's thesis, Universidade de Évora, 2015. http://hdl.handle.net/10174/13275.

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Angola is among the largest countries in Africa and due to its great geographical and climatic variety, presents a great diversity of biomes and habitats. However, is one of few biodiverse countries in Africa that remains highly incomplete in knowledge of vertebrate diversity. Data regarding the occurrence and geographical distribution of amphibians and reptiles in Angola are currently scattered across museum specimens housed in Natural History institutions and in a diversity of books and papers published since the second half of the nineteenth century, and there is no available distribution d

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42

Kluthe, Gregory Joseph. "Relative Heart Ventricle Mass and Cardiac Performance in Amphibians." PDXScholar, 2012. https://pdxscholar.library.pdx.edu/open_access_etds/920.

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This study used an in situ heart preparation to analyze the power and work of spontaneously beating hearts of four anurans (R. marina, L. catesbeianus, X. laevis, P. edulis) and three urodeles (N. maculosus, A. tigrinum, A. tridactylum) in order to elucidate the meaning of relative ventricle mass (RVM) in terms of specific cardiac performance variables. This study also tests two hypotheses: 1) the ventricles of terrestrial species (R. marina, P. edulis, A. tigrinum) of amphibians are capable of greater maximum power outputs (Pmax) compared to aquatic species (X. laevis, A. tridactylum, N. macu

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43

Vasconcelos, Daniel. "Amphibian and Vegetation Dynamics in a Restored Wetland in Maine." Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/VasconcelosD2003.pdf.

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44

Callison, Catherine Mary. "Factors Influencing Oviposition Among Pond-Breeding Amphibians: Exotic Vegetation, Oviposition Braces, and Cover." PDXScholar, 2001. https://pdxscholar.library.pdx.edu/open_access_etds/4333.

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I examined oviposition in four pond-breeding amphibians (northwestern salamander [Ambystoma gracile], long-toed salamander [Ambystoma macrodactylum], Pacific treefrog [Hyla regilla], northern red-legged frog [Rana aurora aurora]), at Burlington Bottoms, a lowland riverine site in northwestern Oregon, to determine whether differential use of native versus exotic plant substrates occurs. I found differential use in all four species, but use was inconsistent with the hypothesis that selection for native plants (or selection against exotic plants) was occurring. If selection was occurring, the pat

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45

Cunningham, Jesse. "Pond-Breeding Amphibian Species Distributions in a Beaver-Modified Landscape, Acadia National Park, Mount Desert Island, Maine." Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/CunninghamJ2003.pdf.

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46

Blomquist, Sean Michael. "Relative Fitness and Behavioral Compensation of Amphibians in a Managed Forest." Fogler Library, University of Maine, 2008. http://www.library.umaine.edu/theses/pdf/BlomquistSM2008.pdf.

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47

Favero, Eduardo Rondelli. "Caracterização citogenetica de especies e populações de Pseudopaludicola (Leiuperidae, Anura)." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/317990.

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Orientadores: Shirlei Maria Recco-Pimentel, Ana Cristina Prado Veiga-Menoncello<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia<br>Made available in DSpace on 2018-08-12T04:20:05Z (GMT). No. of bitstreams: 1 Favero_EduardoRondelli_M.pdf: 1364067 bytes, checksum: 03d34437fbe08a46a8cdd3631aaedcc9 (MD5) Previous issue date: 2008<br>Resumo: O gênero Pseudopaludicola, pertencente à família Leiuperidae, compreende atualmente 12 espécies de rãs de pequeno tamanho, distribuídas pela América do Sul, sendo a ocorrência de oito delas foi relatada para o Brasil. Devi

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48

Mazerolle, Marc J. "Amphibians in fragmented peat bogs, abundance, activity, movements and size." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ49408.pdf.

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49

Griffis-Kyle, Kerry L. "The effects of mineral nitrogen on embryonic and larval amphibians." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2005. http://proquest.umi.com/login?COPT=REJTPTU0NWQmSU5UPTAmVkVSPTI=&clientId=3739.

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50

Pahkala, Maarit. "Evolutionary ecology of ultraviolet-B radiation stress tolerance in amphibians." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2001. http://publications.uu.se/theses/91-554-5081-4/.

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